Illuminance Converter

The quantity of light shining on a certain region of an object's surface is expressed as illumination. This number is based on how brightly various wavelengths of light, which correspond to different colors, are seen by humans. Because humans perceive light with a wavelength of around 550 nanometers and near by (green) as brighter than light with longer or shorter wavelengths (purple, blue, red), illumination estimates are modified for each wavelength. It's common to compare illumination to how bright something seems to the human eye.

The region across which the light is dispersed has an inverse relationship with illumination. Accordingly, illuminance for a given light source would be higher for a smaller area and lower for a larger area.

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